Cannon W.F. Revisions of stratigraphic nomenclature within the Keweenawan Supergroup of northern Michigan. Geochemistry,petrography,and volcanology of rhyolites of the Portage Lake Volcanics,Keweenaw Peninsula,Michigan ; S. W. Nicholson ; W.F.Cannon,S.W.Nicholson, 1992. - V,A8,V,B57 p. p. - Текст : непосредственный.